As I said it happens in any file, just if I try to create a terrain from 2 simple curves drawn by "freehand".
This is a full text of the error:
body_lib6g6.rbe
2254
block in proximity_point_curve_by_circle
body_lib6g6.rbe
2249
each
body_lib6g6.rbe
2249
proximity_point_curve_by_circle
toposhaperalgo.rbe
2419
block in altitude_at_point
toposhaperalgo.rbe
2417
each
toposhaperalgo.rbe
2417
altitude_at_point
toposhaperalgo.rbe
2390
altitude_multi
toposhaperalgo.rbe
427
block in top_processing
toposhaperalgo.rbe
425
each
toposhaperalgo.rbe
425
each_with_index
toposhaperalgo.rbe
425
top_processing
toposhapertool.rbe
574
algo_processing
toposhapertool.rbe
666
execute_validate
toposhaperpalette.rbe
130
execute_from_palette
toposhaperpalette.rbe
76
notify_from_palette
toposhaperpalette.rbe
518
call
toposhaperpalette.rbe
518
block (2 levels) in palette_validate
body_lib6palette.rbe
3596
call
body_lib6palette.rbe
3596
execute_button
body_lib6palette.rbe
3401
onLButtonUp
lib6palette.rbe
91
onLButtonUp
toposhapertool.rbe
984
onLButtonUp
